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• org.apache.kafka.server.AssignmentsManager

Proposed Changes

• Deprecate the

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• metric org.apache.kafka.server:type=

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• AssignmentsManager.
• Introduce a new metric: kafka.server:type=

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• AssignmentsManager, consistent with other Kafka metrics.
• This change will impact external monitoring systems that rely on

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• the old metric name; corresponding updates will be required.

Compatibility, Deprecation, and Migration Plan

1. We will add Add a deprecated @Deprecated annotation on to `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC`METRIC`.
2. Update the Kafka documentation to note that the MBean :
   1. Note the deprecation of `org.apache.kafka.server:type=AssignmentsManager`
   will be deprecated and add new metrics
   1. .
   2. Introduce `kafka.server:type=AssignmentsManager`
   which will replaced `org.apache.kafka.server:type=AssignmentsManager` at next major release.
   1. as its replacement.
3. Introduce a new constant Add new `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC_NAME` which `metricName` is with the metricName set to `kafka.server:type=AssignmentsManager`  AssignmentsManager`, and add register it to in `AssignmentsManager#metricsRegistry`.
4. Delete In the next major release: Remove the deprecated `AssignmentsManager#QUEUED_REPLICA_TO_DIR_ASSIGNMENTS_METRIC` at the next major release and remove it . Clean it up from `AssignmentsManager#metricsRegistry`.

Test Plan

• Add new tests to verify the new metric is correctly registered and behaves as expected.
• Ensure backward compatibility by verifying deprecated metric behavior until removalWe should add new test for new metrics works expected as deprecated test.

Rejected Alternatives

n/a